#adum6132 #gatedriver #inputcapacitance #200pf

Hello, I am using 6132 gate driver for the first time. I have a question about this gate driver application.

In the datasheet, It says gate driver is capable of driving loads typically of 200pf. I need to know max. load input capacitance value that this gate driver can drive effectively. The reason I am asking this question is that the current buffer circuit I use has input capacitance of 1000pf. I need to make sure that this gate driver is capable of driving that much of a load.

Thank you in advance,

Alper

Parents
  • +1
    •  Analog Employees 
    on Sep 12, 2019 6:06 PM

    Alper

    The ADuM6132 is specified with 200pF load and output current peaks of 200mA.  This means the output rise time would be dt = C*dV/I = 200pF*15V/0.2A = 15ns.  For a 1000pF load, the output rise time could be about 5 times this or 75ns.  If this is acceptable for your application, then you could use the ADuM6132.

    By the way, we also have the ADuM5230, which can be used as an isolated half bridge gate driver and has a wider operating range to 105C, while the ADuM6132 operates to a max of only 85C because it runs hot.  I would recommend the use of the ADuM5230 for less power dissipation.

    Regards, Brian

Reply
  • +1
    •  Analog Employees 
    on Sep 12, 2019 6:06 PM

    Alper

    The ADuM6132 is specified with 200pF load and output current peaks of 200mA.  This means the output rise time would be dt = C*dV/I = 200pF*15V/0.2A = 15ns.  For a 1000pF load, the output rise time could be about 5 times this or 75ns.  If this is acceptable for your application, then you could use the ADuM6132.

    By the way, we also have the ADuM5230, which can be used as an isolated half bridge gate driver and has a wider operating range to 105C, while the ADuM6132 operates to a max of only 85C because it runs hot.  I would recommend the use of the ADuM5230 for less power dissipation.

    Regards, Brian

Children